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SEKOIA_Malware_Httpshell_Strings

Detects HTTPShell based on URL patterns

MalwareSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2024-01-08
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects HTTPShell based on URL patterns

It defines 6 patterns (6 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-httpshell-strings.yarDetection Rule License 1.1
rule SEKOIA_Malware_Httpshell_Strings : FILE
{
	meta:
		description = "Detects HTTPShell based on URL patterns"
		author = "Sekoia.io"
		id = "58f25666-5dc2-4f4f-9fac-fc05d1e66945"
		date = "2024-01-08"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/malware_httpshell_strings.yar#L1-L20"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "8f6f6ad459cc6edd80432528a507ca2cb84e6859be94f2e1caaea801bf809375"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "/api/v1/Client/Info" wide ascii
		$ = "/api/v1/Client/Download" wide ascii
		$ = "/api/v1/Client/Upload" wide ascii
		$ = "/api/v1/Client/Info" base64 base64wide
		$ = "/api/v1/Client/Download" base64 base64wide
		$ = "/api/v1/Client/Upload" base64 base64wide

	condition:
		3 of them and filesize < 5MB
}

Strings (6 patterns)

IdentifierTypeValueModifiers
$text"/api/v1/Client/Info"wide ascii
$text"/api/v1/Client/Download"wide ascii
$text"/api/v1/Client/Upload"wide ascii
$text"/api/v1/Client/Info"base64 base64wide
$text"/api/v1/Client/Download"base64 base64wide
$text"/api/v1/Client/Upload"base64 base64wide

Condition

3 of them and filesize < 5MB

In plain words (Heuristic)

  • The file must be smaller than 5MB (a cheap guard that skips large files).
  • At least 3 patterns in the rule must match.

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References

Licence & attribution

Author: Sekoia.io

Source repository: SEKOIA.IO Community @ a438a5901a

Licence: Detection Rule License 1.1 (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: 58f25666-5dc2-4f4f-9fac-fc05d1e66945

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE

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